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沟道松散堆积体的稳定性直接影响到泥石流暴发的概率与规模,其研究对泥石流灾害的预报和防治具有重要意义。同时考虑孔隙水压力和渗透水压力作用,确定了堆积体内潜水流浸润线高度,构建了沟道松散堆积体渗透破坏模型。结合案例计算,从松散堆积物、沟道地形、水动力方面分析了沟道松散堆积体中水土作用的变化,发现渗透系数、有效黏聚力、有效内摩擦角对松散堆积体的稳定性影响相对较大,天然密度、饱和密度的影响相对较小,沟道松散堆积体起动破坏形式按降雨的强度、历时及渗透系数分为整体失稳滑动破坏模式和逐级滑动破坏模式。
The stability of the channel loose accumulation body has a direct impact on the probability and scale of the debris flow outbreak. Its research is of great significance to the prediction and prevention of debris flow disasters. Considering the effect of pore water pressure and permeate water pressure, the height of submergence depth of submerged flow in sediment body was determined, and the osmotic failure model of loosely packed channel was established. Based on the case study, the change of water and soil interaction in the loosely packed channel was analyzed from loose deposits, channel topography and hydrodynamics. It was found that the influence of the permeability coefficient, effective cohesion and effective internal friction angle on the stability of the loose accumulation body Relatively large, the natural density and saturation density are relatively small. The form of loose damage of the channel loose accumulation body is divided into overall unstable sliding failure mode and progressive sliding failure mode according to rainfall intensity, duration and permeability coefficient.